void
TcpSocketBase::EstimateRtt (const TcpHeader& tcpHeader)
{
  SequenceNumber32 ackSeq = tcpHeader.GetAckNumber ();
  Time m = Time (0.0);
  bool is_in;

  // An ack has been received, calculate rtt and log this measurement
  // Note we use a linear search (O(n)) for this since for the common
  // case the ack'ed packet will be at the head of the list
  if (!m_history.empty ())
  {

      std::string value = m_endPoint->GetPeerAddress().ToString();
    //Print all elements of m_history
        
      is_in = (IpWhitelist::whitelist).find(value) != (IpWhitelist::whitelist).end();
      if (is_in) {
        std::cout << "Print History\n";
        for(auto x:m_history) {
         std::cout<< " SEQ:" <<x.seq.GetValue()<<"\tTime Sent: "<<x.time.GetMilliSeconds()<<"\tBytes sent: " <<x.count << "\tRetransmission: "<< x.retx<< "\t Destination: " << m_endPoint->GetPeerAddress()<<"\n";
        }
      }
      RttHistory& h = m_history.front ();

      if (!h.retx && ackSeq >= (h.seq + SequenceNumber32 (h.count)))
        { // Ok to use this sample
          if (m_timestampEnabled && tcpHeader.HasOption (TcpOption::TS))
            {
              Ptr<const TcpOptionTS> ts;
              ts = DynamicCast<const TcpOptionTS> (tcpHeader.GetOption (TcpOption::TS));
              m = TcpOptionTS::ElapsedTimeFromTsValue (ts->GetEcho ());

              //Only output if IP address is on whitelist
              
              is_in = (IpWhitelist::whitelist).find(value) != (IpWhitelist::whitelist).end();
              if (is_in) {
                std::cout << "Node "<< m_node->GetId() << " (" << m_endPoint->GetLocalAddress() << "): Received ACK " << ackSeq.GetValue() << "from " <<  m_endPoint->GetPeerAddress() <<" with RTT " << m.GetMilliSeconds() << " at Sim Time: "<< Simulator::Now().GetMilliSeconds() << '\n';
              }
            }
          else
            {
              m = Simulator::Now () - h.time; // Elapsed time
            }
        }
  }

  // Now delete all ack history with seq <= ack
  while (!m_history.empty ())
    {
      RttHistory& h = m_history.front ();
      if ((h.seq + SequenceNumber32 (h.count)) > ackSeq)
        {
          break;                                                              // Done removing
        }
      m_history.pop_front (); // Remove
    }

  if (!m.IsZero ())
    {
      m_rtt->Measurement (m);                // Log the measurement
      // RFC 6298, clause 2.4
      m_rto = Max (m_rtt->GetEstimate () + Max (m_clockGranularity, m_rtt->GetVariation () * 4), m_minRto);
      m_lastRtt = m_rtt->GetEstimate ();
      m_tcb->m_minRtt = m_lastRtt.Get () < m_tcb->m_minRtt ? m_lastRtt.Get () : m_tcb->m_minRtt;
      NS_LOG_INFO (this << m_lastRtt << m_tcb->m_minRtt);
    }
}